Randy I have rem. 1100 3″ 20″ barrel which slug commander or elite.
I would use the “Hybred Elite” on deer size game and under, and the “Commander IDS PLUS” on game weighting over 300 pounds.
The 20″ barrel will work with either sabot slug. You may lose 50ft/sec. Because of that barrel being 3 inches shorter that normal and it is an auto loader.
The “Commander IDS PLUS” is Lightfields “Heavy Game” sabot. A 600 grain
(1 3/8oz) @ 1700ft/sec. That’s a real Heavy weight sabot to use on deer size game!